/in/foo.cc: In function 'int main()':
/in/foo.cc:20:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(a[i]=a[i+1]);
                 ^
/in/foo.cc:30:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(d[x]=d[x-1])
                 ^
/in/foo.cc:12:6: warning: unused variable 'y' [-Wunused-variable]
  int y=n;
      ^
/in/foo.cc:28:12: warning: 'x' is used uninitialized in this function [-Wuninitialized]
  while(x<=n&&yw==1)
        ~~~~^~~~~~~